US20140254201A1 - Power supply for prolonging hold-up time - Google Patents
Power supply for prolonging hold-up time Download PDFInfo
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- US20140254201A1 US20140254201A1 US13/788,765 US201313788765A US2014254201A1 US 20140254201 A1 US20140254201 A1 US 20140254201A1 US 201313788765 A US201313788765 A US 201313788765A US 2014254201 A1 US2014254201 A1 US 2014254201A1
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- power
- hold
- power supply
- storage element
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0096—Means for increasing hold-up time, i.e. the duration of time that a converter's output will remain within regulated limits following a loss of input power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a power supply for prolonging a hold-up time, and particularly to a power supply for prolonging a hold-up time that sustains the power supply to continue operating for a hold-up time using a hold-up power.
- a current alternating-current (AC) power supply provides a delayed operation period, also referred to as a hold-up time.
- a hold-up time As a power density of a power supply gets higher, efficiency and requirements for preventing abnormal powering are also increased. Thus, a longer period of the above hold-up time is also demanded to prolong a sustaining power period.
- a common power supply generally includes a rectifier, a power factor corrector, a voltage stabilizer and a power modulator.
- the rectifier converts an external power to a DC power.
- the power factor corrector modulates a phase of the DC power, and outputs a power that charges the voltage stabilizer.
- the power supply needs to wait until the voltage stabilizer operates in a stable state before it can be normally driven. That is to say, only when the voltage stabilizer is fully charged, the power can then be modulated and outputted.
- the foregoing hold-up time refers to the time when the power supply is incapable of obtaining the external power, the power factor corrector stops converting the power and the voltage stabilizer becomes discharged. There are two common approaches for prolonging the hold-up time.
- a first approach is to increase a storage capacity of the voltage stabilizer
- a second approach is to additionally provide an auxiliary power storage element.
- the increasing of the storage capacity implies a lengthened charging time of the storage element, such that a boot time of the power supply is also increased.
- by enlarging a boot current for shortening the boot time components of the power supply may not be apt to withstand such great boot current.
- the Taiwan Patent Publication 1364651 discloses embodiments of an additionally provided auxiliary power storage element.
- hold-up power is stored by an auxiliary power storage element, which provides the hold-up power for prolonging the hold-up time in the event of an abnormal external power. Nevertheless, as the auxiliary power storage element is directly connected in parallel with the storage element, meaning that an equivalent load of the power supply is virtually increased to disfavor an overall powering performance of the power supply.
- the primary object of the present invention is to overcome issues of a slow booting process and an increased load upon a main power supply system, which are derived from an intention of prolonging a hold-up time in a conventional power supply architecture and approach.
- the power supply comprises a main power supply system and a hold-up time powering system.
- the main power supply system comprises a rectification unit for receiving and rectifying an external power to output a first power, a power factor correction unit for receiving the first power and modulating a phase of the first power to generate a second power, a voltage stabilization element for receiving and stabilizing the second power, and a power modulation unit, connected to the voltage stabilization element for converting the second power to output an operating power.
- the power factor correction unit has an input end connected to the rectification unit, and an output end connected to the voltage stabilization element.
- the hold-up power system connected in parallel to the power factor correction unit, comprises an isolation transformer element connected to the input end of the power factor correction unit for transforming the first power to a third power, a power storage element for receiving the third power and storing as a hold-up power, and a power comparison unit disposed between the output end of the power factor correction unit and the power storage element for obtaining the second power and the hold-up power.
- the power comparison unit comprises a first status, a second status and a third status.
- the first status renders the power storage element be continuously charged when the second power is greater than the hold-up power
- the second status renders the power storage element to be no longer charged when the second power is equal to the hold-up power
- the third status prompts the power storage element to output the hold-up power to the power modulation unit to continue converting the operating power for a hold-up time when the second power is smaller than the hold-up power.
- the hold-up power supply system comprises a charging control unit for controlling a conduction status of the isolation transformer element. Further, the charging control unit comprises a power switch element, and a driving control unit for controlling a conduction status of the power switch element.
- the hold-up power supply system comprises a one-directional conduction element.
- the one-directional conduction element is connected between the isolation transformer element and the power storage element, and limits a current direction for conducting the power storage element. Further, the one-directional conduction element is a diode.
- the power storage element is a group selected from a battery element or a capacitor.
- the power comparison unit is a diode:
- the power supply for prolonging a hold-up time disclosed by the present invention features the advantages below.
- a load of the main power supply system is kept unaffected.
- the power storage element is not connected in parallel to the voltage stabilization element, and the power storage element is charged using the third power induced by magnetic coupling of the isolation transformer element.
- the equivalent load of the main power supply system in operation of the present invention is substantially kept unaffected.
- the power storage process is performed by a current of a smaller power.
- the power storage element is charged by the third power having a smaller current value. Therefore, not only the overall operation of the power supply is not influenced but also the load of the main power supply system is not further burdened.
- FIG. 1 is a block diagram of a power supply for prolonging a hold-up time according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram of a power supply for prolonging a hold-up time according to an embodiment of the present invention.
- a power supply for prolonging a hold-up time is capable of sustaining a hold-time of the power supply.
- a power system comprises a main power supply system 1 and a hold-up power supply system 2 .
- the main power supply system 1 comprises a rectification unit 11 , a power factor correction unit 12 connected to the rectification unit 11 , a voltage stabilization element 13 , and a power modulation unit 14 connected to the voltage stabilization element 13 .
- the rectification unit 11 is connected to an external power source 3 , and receives and rectifies the external power to output a first power.
- the power factor correction unit 12 receives the first power, adjusts phases of the current and voltage of the first power such that a power factor of the first power satisfies a predetermined requirement, and converts the phase-adjusted first power to output a second power.
- the power factor correction unit 12 has an input end 121 connected to the rectification unit 11 , and an output end 122 connected to the voltage stabilization element 13 .
- the voltage stabilization element 13 receives and stores the second power from the output end 122 of the power factor correction unit 12 , and generates a stabilized voltage when having become stable.
- the power modulation unit 14 is connected to the voltage stabilization element 13 , and converts the second power to output an operating power.
- the main power supply system 1 further comprises a power integration backplane 15 connected subsequent to the power modulation unit 14 .
- the power integration backplane 15 integrates the operating power to the information processing apparatus.
- N represents the number of power supplies by the backup power system for driving a total power load operated by the information processing apparatus
- M represents the tolerable number of damaged power supplies.
- the power factor correction unit 12 comprises a pulse width control unit 123 for controlling operations of the power factor correction unit 12 .
- the hold-up power supply system 2 is connected in parallel to the power factor correction unit 12 . More specifically, the hold-up power supply system 2 comprises an isolation transformer element 21 connected to the input end 121 , a power storage element 22 connected to the isolation transformer element 21 , and a power comparison unit 23 disposed between the output end 122 and the power storage element 21 .
- the isolation transformer element 21 has a primary coil 211 , and a secondary coil 212 that magnetically couples with the primary coil 211 . Further, the isolation transformer element 21 is coupled to the input end 121 of the power factor correction unit 12 via the primary coil 211 , and is connected to the power storage element 22 via the secondary coil 212 .
- the isolation transformer element 21 After receiving the first power, the isolation transformer element 21 outputs a third power from the magnetic coupling of the primary coil 211 and the secondary coil 213 . Further, the number of turns of the primary coil 211 may be smaller than that of the secondary coil 212 . That is to say, a power potential of the third power generated after transformation performed by the isolation transformer element 21 is higher than a potential of the first power.
- the power storage element 22 receives and stores the third power from the secondary coil 212 and thus contains a hold-up power.
- the power storage element 22 may be a group selected from a battery element or a capacitor. Further, the isolation transformer element 21 is connected to a current limiting resistor 24 .
- the current of the first power is divided due to the resistance in the current limiting resistor 24 and the equivalent resistance of the power factor correction unit 12 , the voltage stabilization element 13 and the power modulation unit 14 .
- the current limiting resistor 24 maintains the current received by the hold-up power supply system 2 to be smaller than the current received by the power factor correction unit 12 . That is to say, the hold-up power supply system 2 of the present invention is charged by a smaller power for reducing an operation load of the main power supply system 1 .
- the current received by the power factor correction unit 12 is several times of the current received by the hold-up power supply system 2 , e.g., preferably ten times.
- the hold-up power supply system 2 further comprises a charging control unit 25 connected to the isolation transformer element 21 .
- the charging control unit 25 controls a conduction status of the isolation transformer element 21 .
- the charging control unit 25 comprises a power switch element 251 , and a driving control unit 252 for controlling a conduction status of the power switch element 251 .
- the power switch element 251 may be a group selected from a bipolar junction transistor (BJT), a metal-oxide semiconductor field-effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT).
- BJT bipolar junction transistor
- MOSFET metal-oxide semiconductor field-effect transistor
- IGBT insulated gate bipolar transistor
- the driving control unit 252 may determine the conduction of the power switch element 251 through feedback control or timing control. As implementation methods of the driving control unit 252 are quite diversified, details thereof are not limited by the embodiment of the present invention.
- the driving control unit 252 drives and turns on the power switch element 251 , and the isolation transformer element 21 performs power transformation to output the third power for charging the power storage element 22 .
- the hold-up power supply system 2 comprises a one-directional conduction element 26 connected between the isolation transformer element 21 and the power storage element 22 .
- the one-directional conduction element 26 may be a diode, and restrains the current of the hold-up power supply system 2 from flowing towards the isolation transformer element 21 . That is to say, the one-directional conduction element 26 limits the current of the third power to conduct towards only the power storage element 22 .
- the power comparison unit 23 has a first status, a second status and a third status.
- the first status of the power comparison unit 23 renders the power storage element 22 to be continuously charged when the second power is greater than the hold-up power.
- the second status of the power comparison unit 23 renders the power storage element 22 to be no longer charged when the second power is equal to the hold-up power.
- the third status of the power comparison unit 23 prompts the power storage element 22 to output the hold-up power to the power modulation unit 14 when the second power is smaller than the hold-up power.
- the power storage element 22 at this point is not stored with any power.
- the power storage element 22 does not contain the hold-up power when the power supply is initially powered on.
- the first power is outputted to the power factor correction unit 12 for phase modulation, and is also outputted to the isolation transformer element 21 .
- the isolation transformer element 21 receives the first power
- the isolation transformer element 21 converts the first power via the primary coil 211 and the secondary coil 212 to output the third power to the power storage element 22 .
- the power storage element 22 receives the third power and becomes charged, with however the stored power still being smaller than the second power.
- the power comparison unit 23 at this point is in the first status. After charging the power storage element 22 for a period of time, the power potential of the hold-up power rises to equal to the second power, and the power comparison unit 23 changes to the second status, such that the charging process stops while the power potential of the hold-up power is still maintained. In the event that the main power supply system 1 is incapable of normally obtaining the external power, the power potential of the second power is affected and gradually lowers. When the power potential of the second power is lowered to the hold-up power, the power comparison unit 23 enters the third status, and the power storage element 22 outputs the hold-up power to keep powering the power modulation unit 14 to continue operating for the hold-up time. Thus, a user is allowed to perform operations such as file saving on the information processing apparatus or shutting down the information processing apparatus within the hold-up time. Further, the length of the hold-up time is determined by the amount of the power storage in the power storage element 22 .
- a hold-up power supply system is connected in parallel to a power factor correction unit in a main power supply system.
- the hold-up power supply system comprises: an isolation transformer element, connected to the power factor correction unit, for receiving and transforming a first power to a third power; a power storage element, for receiving the third power, comprising a power storage element storing a hold-up power; and a power comparison unit, connected between the power factor correction unit and the power storage element.
- the power comparison unit compares a second power generated from phase modulation performed by the power factor correction unit and the hold-up power, and outputs the hold-up power when the second power is smaller than the hold-up power, so as to sustain the power modulation unit to continue operating for a hold-up time.
Abstract
A power supply for prolonging a hold-up time includes a main power supply system, and a hold-up power supply system connected in parallel to a power factor correction unit in the main power supply system. The hold-up power supply system includes an isolation transformer element connected to the power factor correction unit for receiving and transforming a first power to a third power, a power storage element for receiving the third power and storing as a hold-up power, and a power comparison unit connected between the power factor correction unit and the power storage element. The power comparison unit compares a second power generated from phase modulation performed by the power factor correction unit and the hold-up power, and outputs the hold-up power when the second power is smaller than the hold-up power, so as to sustain the power modulation unit to continue operating for a hold-up time.
Description
- The present invention relates to a power supply for prolonging a hold-up time, and particularly to a power supply for prolonging a hold-up time that sustains the power supply to continue operating for a hold-up time using a hold-up power.
- In order to sustain in supplying power for a period time in the event of an external power interrupt and to allow a load to complete necessary storage and control operations for a safe shut-down, a current alternating-current (AC) power supply provides a delayed operation period, also referred to as a hold-up time. However, as a power density of a power supply gets higher, efficiency and requirements for preventing abnormal powering are also increased. Thus, a longer period of the above hold-up time is also demanded to prolong a sustaining power period.
- A common power supply generally includes a rectifier, a power factor corrector, a voltage stabilizer and a power modulator. At an initial stage of booting, the rectifier converts an external power to a DC power. The power factor corrector modulates a phase of the DC power, and outputs a power that charges the voltage stabilizer. The power supply needs to wait until the voltage stabilizer operates in a stable state before it can be normally driven. That is to say, only when the voltage stabilizer is fully charged, the power can then be modulated and outputted. The foregoing hold-up time refers to the time when the power supply is incapable of obtaining the external power, the power factor corrector stops converting the power and the voltage stabilizer becomes discharged. There are two common approaches for prolonging the hold-up time. A first approach is to increase a storage capacity of the voltage stabilizer, and a second approach is to additionally provide an auxiliary power storage element. However, the increasing of the storage capacity implies a lengthened charging time of the storage element, such that a boot time of the power supply is also increased. On the other hand, by enlarging a boot current for shortening the boot time, components of the power supply may not be apt to withstand such great boot current. The Taiwan Patent Publication 1364651 discloses embodiments of an additionally provided auxiliary power storage element. In the above publication, hold-up power is stored by an auxiliary power storage element, which provides the hold-up power for prolonging the hold-up time in the event of an abnormal external power. Nevertheless, as the auxiliary power storage element is directly connected in parallel with the storage element, meaning that an equivalent load of the power supply is virtually increased to disfavor an overall powering performance of the power supply.
- Therefore the primary object of the present invention is to overcome issues of a slow booting process and an increased load upon a main power supply system, which are derived from an intention of prolonging a hold-up time in a conventional power supply architecture and approach.
- To achieve the above object, a power supply for prolonging a hold-up time is provided. The power supply comprises a main power supply system and a hold-up time powering system. The main power supply system comprises a rectification unit for receiving and rectifying an external power to output a first power, a power factor correction unit for receiving the first power and modulating a phase of the first power to generate a second power, a voltage stabilization element for receiving and stabilizing the second power, and a power modulation unit, connected to the voltage stabilization element for converting the second power to output an operating power. Further, the power factor correction unit has an input end connected to the rectification unit, and an output end connected to the voltage stabilization element. The hold-up power system, connected in parallel to the power factor correction unit, comprises an isolation transformer element connected to the input end of the power factor correction unit for transforming the first power to a third power, a power storage element for receiving the third power and storing as a hold-up power, and a power comparison unit disposed between the output end of the power factor correction unit and the power storage element for obtaining the second power and the hold-up power. The power comparison unit comprises a first status, a second status and a third status. Wherein, the first status renders the power storage element be continuously charged when the second power is greater than the hold-up power, the second status renders the power storage element to be no longer charged when the second power is equal to the hold-up power, and the third status prompts the power storage element to output the hold-up power to the power modulation unit to continue converting the operating power for a hold-up time when the second power is smaller than the hold-up power.
- In an embodiment, the hold-up power supply system comprises a charging control unit for controlling a conduction status of the isolation transformer element. Further, the charging control unit comprises a power switch element, and a driving control unit for controlling a conduction status of the power switch element.
- In an embodiment, the hold-up power supply system comprises a one-directional conduction element. The one-directional conduction element is connected between the isolation transformer element and the power storage element, and limits a current direction for conducting the power storage element. Further, the one-directional conduction element is a diode.
- In an embodiment, the power storage element is a group selected from a battery element or a capacitor.
- In an embodiment, the power comparison unit is a diode:
- Compared to the prior art, the power supply for prolonging a hold-up time disclosed by the present invention features the advantages below.
- First of all, a load of the main power supply system is kept unaffected. In the present invention, the power storage element is not connected in parallel to the voltage stabilization element, and the power storage element is charged using the third power induced by magnetic coupling of the isolation transformer element. Compared to the prior art of directly charging the power storage element with the second power, the equivalent load of the main power supply system in operation of the present invention is substantially kept unaffected.
- Secondly, the power storage process is performed by a current of a smaller power. In the present invention, the power storage element is charged by the third power having a smaller current value. Therefore, not only the overall operation of the power supply is not influenced but also the load of the main power supply system is not further burdened.
- The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
-
FIG. 1 is a block diagram of a power supply for prolonging a hold-up time according to an embodiment of the present invention. -
FIG. 2 is a schematic diagram of a power supply for prolonging a hold-up time according to an embodiment of the present invention. - Referring to
FIG. 1 andFIG. 2 , when an external power cannot be acquired in the event of a sudden power interrupt or an unexpected blackout while being powered by the external power, a power supply for prolonging a hold-up time according to an embodiment of the present invention is capable of sustaining a hold-time of the power supply. Thus, issues of data loss or damages in elements of an information processing apparatus connected to the power supply can be prevented. According to an embodiment of the present invention, a power system comprises a mainpower supply system 1 and a hold-uppower supply system 2. The mainpower supply system 1 comprises arectification unit 11, a powerfactor correction unit 12 connected to therectification unit 11, avoltage stabilization element 13, and apower modulation unit 14 connected to thevoltage stabilization element 13. Therectification unit 11 is connected to anexternal power source 3, and receives and rectifies the external power to output a first power. The powerfactor correction unit 12 receives the first power, adjusts phases of the current and voltage of the first power such that a power factor of the first power satisfies a predetermined requirement, and converts the phase-adjusted first power to output a second power. More specifically, the powerfactor correction unit 12 has aninput end 121 connected to therectification unit 11, and anoutput end 122 connected to thevoltage stabilization element 13. Thevoltage stabilization element 13 receives and stores the second power from theoutput end 122 of the powerfactor correction unit 12, and generates a stabilized voltage when having become stable. Thepower modulation unit 14 is connected to thevoltage stabilization element 13, and converts the second power to output an operating power. Further, when the power supply of the present invention is implemented to an N+M backup power system, the mainpower supply system 1 further comprises apower integration backplane 15 connected subsequent to thepower modulation unit 14. Thepower integration backplane 15 integrates the operating power to the information processing apparatus. Wherein, N represents the number of power supplies by the backup power system for driving a total power load operated by the information processing apparatus, and M represents the tolerable number of damaged power supplies. Further, the powerfactor correction unit 12 comprises a pulsewidth control unit 123 for controlling operations of the powerfactor correction unit 12. - The hold-up
power supply system 2 is connected in parallel to the powerfactor correction unit 12. More specifically, the hold-uppower supply system 2 comprises anisolation transformer element 21 connected to theinput end 121, apower storage element 22 connected to theisolation transformer element 21, and apower comparison unit 23 disposed between theoutput end 122 and thepower storage element 21. Theisolation transformer element 21 has aprimary coil 211, and asecondary coil 212 that magnetically couples with theprimary coil 211. Further, theisolation transformer element 21 is coupled to theinput end 121 of the powerfactor correction unit 12 via theprimary coil 211, and is connected to thepower storage element 22 via thesecondary coil 212. After receiving the first power, theisolation transformer element 21 outputs a third power from the magnetic coupling of theprimary coil 211 and the secondary coil 213. Further, the number of turns of theprimary coil 211 may be smaller than that of thesecondary coil 212. That is to say, a power potential of the third power generated after transformation performed by theisolation transformer element 21 is higher than a potential of the first power. Thepower storage element 22 receives and stores the third power from thesecondary coil 212 and thus contains a hold-up power. Thepower storage element 22 may be a group selected from a battery element or a capacitor. Further, theisolation transformer element 21 is connected to a current limitingresistor 24. When the first power is outputted to theoutput end 121, the current of the first power is divided due to the resistance in the current limitingresistor 24 and the equivalent resistance of the powerfactor correction unit 12, thevoltage stabilization element 13 and thepower modulation unit 14. The current limitingresistor 24 maintains the current received by the hold-uppower supply system 2 to be smaller than the current received by the powerfactor correction unit 12. That is to say, the hold-uppower supply system 2 of the present invention is charged by a smaller power for reducing an operation load of the mainpower supply system 1. Further, the current received by the powerfactor correction unit 12 is several times of the current received by the hold-uppower supply system 2, e.g., preferably ten times. The hold-uppower supply system 2 further comprises a chargingcontrol unit 25 connected to theisolation transformer element 21. The chargingcontrol unit 25 controls a conduction status of theisolation transformer element 21. More specifically, the chargingcontrol unit 25 comprises apower switch element 251, and a drivingcontrol unit 252 for controlling a conduction status of thepower switch element 251. Thepower switch element 251 may be a group selected from a bipolar junction transistor (BJT), a metal-oxide semiconductor field-effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT). The drivingcontrol unit 252 may determine the conduction of thepower switch element 251 through feedback control or timing control. As implementation methods of the drivingcontrol unit 252 are quite diversified, details thereof are not limited by the embodiment of the present invention. The drivingcontrol unit 252 drives and turns on thepower switch element 251, and theisolation transformer element 21 performs power transformation to output the third power for charging thepower storage element 22. Further, the hold-uppower supply system 2 comprises a one-directional conduction element 26 connected between theisolation transformer element 21 and thepower storage element 22. The one-directional conduction element 26 may be a diode, and restrains the current of the hold-uppower supply system 2 from flowing towards theisolation transformer element 21. That is to say, the one-directional conduction element 26 limits the current of the third power to conduct towards only thepower storage element 22. - In continuation, details of the
power comparison unit 23 applied to the power supply according to an embodiment of the present invention are described below. Thepower comparison unit 23 has a first status, a second status and a third status. The first status of thepower comparison unit 23 renders thepower storage element 22 to be continuously charged when the second power is greater than the hold-up power. The second status of thepower comparison unit 23 renders thepower storage element 22 to be no longer charged when the second power is equal to the hold-up power. The third status of thepower comparison unit 23 prompts thepower storage element 22 to output the hold-up power to thepower modulation unit 14 when the second power is smaller than the hold-up power. More specifically, at an initial phase of converting the external power received by the mainpower supply system 1, thepower storage element 22 at this point is not stored with any power. In other words, thepower storage element 22 does not contain the hold-up power when the power supply is initially powered on. By converting the external power using therectification unit 11 to output the first power, the first power is outputted to the powerfactor correction unit 12 for phase modulation, and is also outputted to theisolation transformer element 21. As theisolation transformer element 21 receives the first power, theisolation transformer element 21 converts the first power via theprimary coil 211 and thesecondary coil 212 to output the third power to thepower storage element 22. Thepower storage element 22 receives the third power and becomes charged, with however the stored power still being smaller than the second power. Thepower comparison unit 23 at this point is in the first status. After charging thepower storage element 22 for a period of time, the power potential of the hold-up power rises to equal to the second power, and thepower comparison unit 23 changes to the second status, such that the charging process stops while the power potential of the hold-up power is still maintained. In the event that the mainpower supply system 1 is incapable of normally obtaining the external power, the power potential of the second power is affected and gradually lowers. When the power potential of the second power is lowered to the hold-up power, thepower comparison unit 23 enters the third status, and thepower storage element 22 outputs the hold-up power to keep powering thepower modulation unit 14 to continue operating for the hold-up time. Thus, a user is allowed to perform operations such as file saving on the information processing apparatus or shutting down the information processing apparatus within the hold-up time. Further, the length of the hold-up time is determined by the amount of the power storage in thepower storage element 22. - In conclusion, in the power supply for prolonging a hold-up time, a hold-up power supply system is connected in parallel to a power factor correction unit in a main power supply system. The hold-up power supply system comprises: an isolation transformer element, connected to the power factor correction unit, for receiving and transforming a first power to a third power; a power storage element, for receiving the third power, comprising a power storage element storing a hold-up power; and a power comparison unit, connected between the power factor correction unit and the power storage element. The power comparison unit compares a second power generated from phase modulation performed by the power factor correction unit and the hold-up power, and outputs the hold-up power when the second power is smaller than the hold-up power, so as to sustain the power modulation unit to continue operating for a hold-up time. With the above circuit architecture, issues of a slow booting process and an increased load of the power system derived by an intention of increasing the hold-up time as in a conventional power supply are solved.
- While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.
Claims (8)
1. A power supply for prolonging a hold-up time, comprising:
a main power supply system, comprising:
a rectification unit, for receiving and rectifying an external power source to output a first power;
a power factor correction unit, for receiving the first power and modulating a phase of the first power to generate a second power;
a voltage stabilization element, for receiving and stabilizing the second power; and
a power modulation unit, connected to the voltage stabilization element, for converting the second power to output an operating power; wherein, the power factor correction unit has an input end connected to the rectification unit and an output end connected to the voltage stabilization element; and
a hold-up power supply system, connected in parallel to the power factor correction unit, comprising:
an isolation transformer element, connected to the input end, for transforming the first power to a third power;
a power storage element, for receiving the third power and storing as a hold-up power; and
a power comparison unit, disposed between the output end and the power storage element to receive the second power and the hold-up power respectively; the power comparison unit comprising a first status for rendering the power storage element to be continuously charged when the second power is greater than the hold-up power, a second status for rendering the power storage element to be no longer charged when the second power is equal to the hold-up power, and a third status for prompting the power storage element to output the hold-up power to the power modulation unit to continue converting the operating power for a hold-up time when the second power is smaller than the hold-up power.
2. The power supply of claim 1 , wherein the hold-up power supply system comprises a charging control unit for controlling a conduction status of the isolation transformer element.
3. The power supply of claim 2 , wherein the charging control unit comprises a power switch element, and a driving control unit for controlling a conduction status of the power switch element.
4. The power supply of claim 1 , wherein the hold-up power supply system comprises a current limiting resistor connected to the isolation transformer element.
5. The power supply of claim 1 , wherein the hold-up power supply system comprises a one-directional conduction element connected between the isolation transformer element and the power storage element to restrain a current direction to conduct towards the power storage element.
6. The power supply of claim 5 , wherein the one-directional conduction element is a diode.
7. The power supply of claim 1 , wherein the power storage element is a group selected from a battery element or a capacitor.
8. The power supply of claim 1 , wherein the power comparison unit is a diode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/788,765 US20140254201A1 (en) | 2013-03-07 | 2013-03-07 | Power supply for prolonging hold-up time |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US13/788,765 US20140254201A1 (en) | 2013-03-07 | 2013-03-07 | Power supply for prolonging hold-up time |
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US20140254201A1 true US20140254201A1 (en) | 2014-09-11 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/788,765 Abandoned US20140254201A1 (en) | 2013-03-07 | 2013-03-07 | Power supply for prolonging hold-up time |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106300982A (en) * | 2015-06-05 | 2017-01-04 | 台达电子工业股份有限公司 | There is the power supply device extending function of holding time |
CN106411154A (en) * | 2015-07-29 | 2017-02-15 | 雅达电子国际有限公司 | Power converter |
US10338658B2 (en) | 2016-05-13 | 2019-07-02 | Dell Products, L.P. | Power supply unit having an extended hold-up time |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5612581A (en) * | 1995-01-18 | 1997-03-18 | Fujitsu Limited | Power supply apparatus with a back-up power unit |
US6504497B2 (en) * | 2000-10-30 | 2003-01-07 | Delta Electronics, Inc. | Hold-up-time extension circuits |
-
2013
- 2013-03-07 US US13/788,765 patent/US20140254201A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5612581A (en) * | 1995-01-18 | 1997-03-18 | Fujitsu Limited | Power supply apparatus with a back-up power unit |
US6504497B2 (en) * | 2000-10-30 | 2003-01-07 | Delta Electronics, Inc. | Hold-up-time extension circuits |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106300982A (en) * | 2015-06-05 | 2017-01-04 | 台达电子工业股份有限公司 | There is the power supply device extending function of holding time |
CN106411154A (en) * | 2015-07-29 | 2017-02-15 | 雅达电子国际有限公司 | Power converter |
US10338658B2 (en) | 2016-05-13 | 2019-07-02 | Dell Products, L.P. | Power supply unit having an extended hold-up time |
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Owner name: ZIPPY TECHNOLOGY CORP., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHIH, TSUN-TE;CHANG, YU-YUAN;CHANG, TIEN-WEI;REEL/FRAME:029944/0822 Effective date: 20130227 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |